显示Java类的Toast通知

Question

I want to create a separate class within my application to handle error reporting and send specific errors to a database. However, I'm unable to figure out what the Context should be and how this should be properly coded. I assume it should still be possible, I just need to code it differently, if that is not the case, what is the best solution for me?

public class SendError implements Runnable
{

    private String url;

    public SendError(String errors, String form, String database, String SQL)
    {
        url = string;

        Handler handler = new Handler();        
        handler.post(new Runnable() {
            public void run() {
                Toast toast = Toast.makeText(getContext, msg, Toast.LENGTH_LONG);
                toast.show();
            }
        });
    }
}

EDIT:

What I'm trying to do is create one class for my entire application that handles recording of SQL errors when submitting data to the database. The class needs to do 2 simple things. Submit information based on what form, database, time submitted, and the SQL code that created the error. The other thing I would like this class to do is to display a toast giving basic error information back to the user. I have the data submission portion of this worked out properly (hence the reason for the Runnable ), but am still getting errors for the Toast.

Answer 1

Shouldn't do the work in your constructor, this makes your separate class useless.

public class SendError implements Runnable
{

    private final Context context;
    private final String url;

    public SendError(Context context, String string) {
        this.context = context;
        this.url = string;
    }

    public void makeToast(String msg, String errors, String form, String database, String SQL) {
       Handler handler = new Handler();        
        handler.post(new Runnable() {
            public void run() {
                Toast toast = Toast.makeText(context, msg, Toast.LENGTH_LONG);
                toast.show();
            }
        });
    }
}

Your context needs to be the relevant context, from using a Toast the Context is usually an Activity which can take the form of:

• this (in an Activity )
• ActivityName.this (in a inner class of an Activity )
• getActivity (in a Fragment inside an Activity )

For example:

 new SendError(YourActivity.this, "something").makeToast("Hello", "errors", "form", "database", "sql");

Answer 2

Just need to pass Context in the constructor when you create this class.

I would advise you rethink this class though - it's called "SendError" which sounds like a method name, it implements Runnable for some reason, and it's notifying the user with Toasts - sounds like too much for one class.

Answer 3

Toast toast = Toast.makeText(getApplicationContext(), msg, Toast.LENGTH_LONG).show();

要么

Toast toast = Toast.makeText(SendError.this, msg, Toast.LENGTH_LONG).show();